Sealing collapsible tubes



Oct. 4, 1938. a. E. JOHNSON 2,132,071 I SEALING COLLAPSIBLE TUBES Filed March 3, 1936 IIIIIIIIIIIIIIIIIIIII Patented 4, 193a 1 Q 2,132,071-

UNITED STATES PATENT OFFICE 2,132,071

SEALIlVG OOLLAPSIBLE TUBES Bror Emil Johnson, Alston, Sweden, assig'nor to Aktiebolaget Gerh; Arehns Mekaniska Yerkstad, Stockholm, Sweden, a joint-stock company of Sweden Application March a, 1936, Serial No.-68,930 In Sweden March 4, 1935 3 Claims. ((1219-) This invention relates to sealing of collapsible nected to the conveyor II in such manner that tubes having a fusible end of tin or lead, for when the tube l is brought into contact with the instance, and itis the object of the invention to pole IS an electric circuit through the tube is provide a particularly simple method and means closed and the contact point between the pole for sealing such tubes. and the tube will be heated so that the tubei In the annexed drawing are shown in Figs. end is sealed by fusing as the tube is moved past 1 and 2 two embodiments of a device for perthe pole I6. I forming the method according to'the invention I claim:- and Fig. 3 shows a side view of a tube end sealed 1. The method of sealing the flattened transby means of said method and having a heading verse end of a collapsible metal tube having its 10 at the sealed end formed by fusion of the metal. walls in contact for a substantial distance from The tube I which consists of a fusible metal, the end to be sealed comprising applying heat to for instance tin, is moved into position between said walls along a transverse line to out said walls the bevelled jaws 2 of a tongs (Fig. 1). The jaws oil by fusion and to fuse thecut oil edges so that i 2 are electrically insulated from the legs 3 of the the fused metal of said edges flows aside upon tongs. The legs 3 are pivoted on a pin 4, and the sides ofthe flattened end portion of said their upper ends have slots 5 in which is movtube, and solidifying the fused metal. able up and down a pin 5 which is secured to a 2. The method of sealing the flattened end of rod 1. The slots 5 are angularly formed so as a collapsible metal tube having its end walls in l to provide for closing and opening the tongs and contact for a substantial distance from the end for maintaining the tongs closed for a short to be sealed comprising supplying heat to said 1 period. The rod 1 is pivotally connected to one walls along a transverse line of the tube and end of an arm 9 which isturnably journalled on angularly to the flattened portion of the walls a pin 8. The other end of the arm 9 carries a adjacent said line, to fuse the metal of said cut 5 roller llwhich is by a spring ll pressed against of! edges so that the fused metal of said edges as a cam disc II which is secured to a continuously flows aside upon the sides of the flattened end rotating shaft II. The jaws 2 are connected to portion of said tube, and solidifying the fused an electric circuit which includes an electric metal. power source. 3. The method of sealing the flattened end J On using the device now described the tube I portions of collapsible metal tubes having their so is moved (possibly by means of a conveyor) into end walls in contact with each other for a sub; position between the open jaws 2, whereafter the stantial distance from the end to be sealed compin 6 is moved downwards so that the tongs are prising passing an electrical current through the closed and held closed for a short period. Thereflattened end walls of a tube in the direction 5 by the electric circuit is closed and the tempertransverse to the flattened end portion, along ature of the edge portion of the tong jaws is ina line, extending transverse to the longitudinal creased so that heat is transmitted from the axis of the tube'and lying in the plane of the edges of the tool to the metal of the tube and the flattened end portion to produce heat by resistend of the tube -is cut off by fusion and sealed ance to melt the metal of the tube along 'said 3 at the same time. Heat is transmitted to the line, transmitting heat to the flattened portion 40 end portion of the tube from the angularly disof the tube adjacent the said line from an angle posed faces of the tongs edges so as to ensure at each side to melt the metal of the flattened that the metal shall flow evenly and form a bead-. portion of the tube for a distance from said line, ing at the cut off end and on the sides adjacent" whereby a beading of molten metal forms at the 5 said end as illustrated in Fig. 3. end and along the sides adjacent said end of the 5 According to Fig. 2 the tube is moved by a 4 flattened portion of the tube, and cooling said conveyor l5 past an electric pole it which is molten heading to solidify the molten metal and electrically connected to an electric power source seal the tube end.

H. The electric power source I1 is also con- BROR EMIL JOHNSON. 

